* removed ddpg2
* removed ddpg2 from codebase
* added tests used in ddpg vs ddpg2 comparison
* added notes about training timesteps to yaml files
* removed ddpg2 yaml files
* removed unnecessary configs from yaml files
* removed unnecessary configs from yaml files
* moved pendulum, mountaincarcontinuous, and halfcheetah tests to tuned_examples
* moved pendulum, mountaincarcontinuous, and halfcheetah tests to tuned_examples
* added more configuration details to yaml files
* removed random starts from halfcheetah